Core for making hollow tiles



(No Model.)

P. R. GREENE.

GORE FOR MAKING HOLLOW TILES.

No. 380,030. Patented Mar. 27, 1888.

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FIE-L21 WITNEEIEEE INVENTUR flwsaw UNITED STATES PATENT OFFICE.

PATRICK R. GREENE, OF BROOKLYN, NEW YORK, ASSIGNOR OF TWO- -THIRDS TO JOHN CLAFFY, OF SAME PLACE, AND PETER BYRNE, OF

JERSEY CITY, NEW JERSEY.

CORE FOR MAKING HOLLOW TILES.

-: SPECIFICATION forming part of Letters Patent No. 380,030, dated March 27, 1888.

Application filed August 17,1887. Serial No. 247,157. (No model.)

To'aZZ whom, it may concern:

Be it known that I, PATRICK R. GREENE, of Brooklyn, county of Kings, State of New York, have invented a new and Improved Core for Making Tubes, of which the following is a specification.

This invention relates to an improved sectional core for making earthenware or other tubes, the invention being particularly applicable for making cement conduits for underground wires. The invention may, however, also be used for forming tubes out of other materials; The core is composed of an annular shell divided into three or more parts by longitudinal cuts, and of a central support or prop around which the shell is placed. After the molding or casting of the tube the central prop is withdrawn, whereupon the sectional shell will collapse and may be readily removed.

The invention consists in the various features of improvement, more fully pointed out in the claims.

In the accompanying drawings, Figure 1 is a top view of the core complete. Fig. 2 is a cross-section on line :0 :0, Fig. 1. Figs. 3, 4, and 5 are detail views of the parts I), c, and d, respectively.

The letter a represents a central plug, prop, or other support made of wood or other material. Around this prop there is placed a sectional core or shell, which, when properly put together, is of annular shape, or of such other shape as the bore of the tube is to have. This core or shell is preferably made of three pieces, I), c, and d, though it may be made of more pieces. Thepieces b and dare alike, and have each a straight edge and a slanting or cut-away edge. Between these slanting edges of the pieces 12 d the third piece, a, is introduced. This piece is wedge-shapedthat.is,

itismade with converging edgesand,together with the pieces I; d,completes the shell or core. The slanting edges of the pieces I) d are beveled inwardly, and the two edges of the wedge c are beveled outwardly, so that when the central prop is withdrawn the wedge will have a tendency to drop inward, thus causing a collapse of the shell. I prefer to make the Wedge a somewhat longer than the pieces I) d, so that it projects with its contracted end beyond the ends of such pieces.

The operation of the device is as follows: The shell being snugly fitted around the prop a, makes acomplete solid core, around which the tube is formed in suitable manner. Then the prop is withdrawn. To overcome any adhesion of the shell to the work, the wedge c is pushed inward at its exposed end, thus opening the joints between the wedge and the side pieces and causing a complete collapse of 'the shell, the separate pieces of which may then hewithdrawn. The beveled edges of the side pieces and of the wedge will materially aid in this collapse.

What I claim is 1. The combination of central prop. a, with sectional shell I) c d, of which the sections b d have each aslanting and inwardly-beveled edge, and the section 0 is made with converging edges and has both edges beveled outwardly, substantially as specified.

2. The combination of central prop, a, with slanting sections 1) d, and wedge-shaped section 0, projecting beyond sectionsb d, substantially as specified.

PATRICK R. GREENE.

Witnesses:

WILLIS H. WINN, DOUGLAS A. LEvIEN, Jr. 

